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为了探究高瓦斯易自燃煤体低温氧化过程中煤体内部裂隙发育演化过程,掌握低温氧化对煤体裂隙发育的作用机理,通过核磁共振技术来检测低温氧化过程中煤体内部孔隙孔径和数量的演化规律,并使用气相色谱和工业分析实验分析煤体裂隙发育过程。实验表明:随着煤体氧化温度的升高,煤体内部孔隙的孔径和数量均有增加,在200℃的升温区间内孔隙率上升了72.2%;气相色谱和工业分析实验证明低温氧化过程中煤体整个裂隙发育过程分2个阶段进行,在低温氧化初期(30~130℃),由于煤体内部水分流失、蒸发,导致内部微孔扩张、连通成中孔,在低温氧化后期(130~230℃),由于煤体内部大分子和挥发分氧化分解,导致内部中孔开始扩张、连通成大孔和微裂隙。
In order to explore the evolution process of internal fissures in coal during low temperature oxidation of high-gas-prone coal sponges and to understand the mechanism of low-temperature oxidation on the development of fissures in coal and to detect the pore size and number of pores in coal during low temperature oxidation by using nuclear magnetic resonance The evolution of coal and the use of gas chromatography and industrial analysis of experimental analysis of coal body fissure development. The experimental results show that with the increase of coal oxidation temperature, the pores and the number of pores in coal increase. The porosity increases by 72.2% in the temperature range of 200 ℃. The results of gas chromatography and industrial analysis show that during the low-temperature oxidation During the initial stage of low-temperature oxidation (30 ~ 130 ℃), internal micropores expand and connect with mesopores due to water loss and evaporation in the coal body. During the low-temperature oxidation (130 ~ 230 ℃). Due to the oxidative decomposition of the macromolecules and volatile components inside the coal, the internal mesopores begin to expand and become large pores and micro-fractures.